The Joint Collaborative Team on Video Coding (jct-vc) of itu-t wp3/16 and iso/iec jtc 1/ sc 29/ wg 11 held its tenth meeting during 11-20 July 2012 at the City Conference Centre (ccc), a k. a

JCTVC-J0544 BoG report on ALF boundary processing [Y.-W. Huang]

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  Text presented in track B, includes text from JCTVC-J0266
  
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  Software is included, further check may be necessary that it is aligned with text (i.e. software shall follow the text when integrated in HM8
  
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  In case that ALF would be removed from the draft, further modifications are necessary
  
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  Check for possible interaction issues with text/software from JCTVC-J0563 (done, SAO related part of boundary padding modifications merged in v2 of JCTVC-J0563)
  

One issue was raised about the relationship with virtual boundary processing. It is understood that the deactivation of ALF as soon as any of the filter taps would access a sample beyond a boundary (slice, tile or picture) has higher priority than VB processing.

It was asked whether there will ever be FGS in HEVC? If not, it is unlikely that a visual problem occurs by removing the padding.

This question was further discussed later. It was remarked that the text is not correct, the potential benefit is small, and there are serious associated complexity implications. Decision: Remove from draft (and software) – although not high priority to remove – almost only an editorial change, since already prohibited in the Main profile.